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Lawrence Berkeley National Laboratory Recent Work Lawrence Berkeley National Laboratory Recent Work Title Transcriptomic analysis of the highly efficient oil-degrading bacterium Acinetobacter venetianus RAG-1 reveals genes important in dodecane uptake and utilization. Permalink https://escholarship.org/uc/item/1nh7p66d Journal FEMS microbiology letters, 363(20) ISSN 0378-1097 Authors Kothari, Ankita Charrier, Marimikel Wu, Yu-Wei et al. Publication Date 2016-10-01 DOI 10.1093/femsle/fnw224 Peer reviewed eScholarship.org Powered by the California Digital Library University of California FEMS Microbiology Letters, 363, 2016, fnw224 doi: 10.1093/femsle/fnw224 Advance Access Publication Date: 22 September 2016 Research Letter R E S E A RCH L E T T E R – Physiology & Biochemistry Transcriptomic analysis of the highly efficient oil-degrading bacterium Acinetobacter venetianus RAG-1 reveals genes important in dodecane uptake and utilization Ankita Kothari1, Marimikel Charrier1, Yu-Wei Wu1,2, Stephanie Malfatti3, Carol E. Zhou4, Steven W. Singer1, Larry Dugan2,3 and Aindrila Mukhopadhyay1,∗ 1Biological Systems and Engineering, Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8099, USA, 2Graduate Institute of Biomedical Informatics, Taipei Medical University, Taipei 110, Taiwan Biosciences, 3Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA 94550-5507, USA and 4Computing Applications and Research Department, Lawrence Livermore National Laboratory, Livermore, CA 94550-9234, USA ∗Corresponding author: Biological Systems and Engineering, Lawrence Berkeley National Laboratory, Berkeley, CA 94720-8099, USA. Tel: 510-495-2628; E-mail: [email protected] One sentence summary: Analysis of the transcriptome of the oil-degrading bacterium Acinetobacter venetianus RAG-1 helps in identification of genes that are involved in uptake and metabolism of alkanes, thus helping in bioremediation. Editor: Hermann Heipieper ABSTRACT The hydrocarbonoclastic bacterium Acinetobacter venetianus RAG-1 has attracted substantial attention due to its powerful oil-degrading capabilities and its potential to play an important ecological role in the cleanup of alkanes. In this study, we compare the transcriptome of the strain RAG-1 grown in dodecane, the corresponding alkanol (dodecanol), and sodium acetate for the characterization of genes involved in dodecane uptake and utilization. Comparison of the transcriptional responses of RAG-1 grown on dodecane led to the identification of 1074 genes that were differentially expressed relative to sodium acetate. Of these, 622 genes were upregulated when grown in dodecane. The highly upregulated genes were involved in alkane catabolism, along with stress response. Our data suggest AlkMb to be primarily involved in dodecane oxidation. Transcriptional response of RAG-1 grown on dodecane relative to dodecanol also led to the identification of permease, outer membrane protein and thin fimbriae coding genes potentially involved in dodecane uptake. This study provides the first model for key genes involved in alkane uptake and metabolism in A. venetianus RAG-1. Keywords: alkane hydroxylase; alkane monooxygenase; dodecane; alkane uptake; transcriptomic; Acinetobacter venetianus RAG-1 ATCC 31012 Received: 25 August 2016; Accepted: 22 September 2016 C FEMS 2016. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reproduction and distribution of the work, in any medium, pro- vided the original work is not altered or transformed in any way, and that the work is properly cited. For commercial re-use, please contact [email protected] 1 2 FEMS Microbiology Letters, 2016, Vol. 363, No. 20 INTRODUCTION DR1. This suggests differences in their hydrocarbonoclastic phe- notype making it imperative to specifically study the powerful Release of hydrocarbons into the environment, accidentally or alkane-degrading strain RAG-1. due to industrial practices, is a major cause of environmen- Pairwise comparative analyses were performed on RAG-1 tal pollution. Hence, the hydrocarbonoclastic capacities of var- grown in dodecane, dodecanol and sodium acetate (control, ious Gammaproteobacteria have drawn attention as a possible hereafter referred to as acetate). Differentially expressed genes strategy for oil spill bioremediation (van Beilen et al. 2003, 2007; important in dodecane degradation were identified. This is the Wentzel et al. 2007). We focus on the degradation of dodecane, first study to (i) specifically look at transcriptomic response ina which is known to be a contaminant in areas related to fuel spills hydrocarbonoclastic bacteria grown on dodecane, and (ii) com- (Gunasekera et al. 2013) and heavy metal mining where it is used pare gene expression data between cultures grown on an alkane as a solvent for radionuclide extraction (Baumgaertner and Fin- and the corresponding alkanol, obtaining confirmation of the sterwalder 1970; Alibrahim and Shlewit 2007; Nakashima and role of alkMa and alkMb genes in dodecane metabolism along Kolarik 2007). with identification of potential ancillary genes involved in dode- The n-alkanes are typically functionalized by oxidation of cane uptake. Uncovering the genetic determinants responsible one terminal methyl group to generate the corresponding al- for AlkM-based dodecane degradation capacity will be helpful in cohol by an alkane hydroxylase system. This system consists developing effective bioremediation strategies. of three components: an integral membrane protein alkane monooxygenase, AlkB, a soluble NADH-rubredoxin reductase, MATERIALS AND METHODS AlkT, and a soluble rubredoxin, AlkG (Eggink et al. 1987;Kok et al. 1989; van Beilen et al. 2001). Together, these protein com- Additional details can be found in Supplementary Information ponents, along with two redox cofactors (NADH and FAD) cat- 2 (Supporting Information). alyze the conversion of an alkane to the corresponding alkanol. The alkanol is further oxidized via a pathway involving an alco- Bacterial strains and culture conditions hol dehydrogenase (AlkJ), aldehyde dehydrogenase (AlkH) and acyl-CoA synthetase (AlkK), followed by the β-oxidation path- Acinetobacter venetianus RAG-1 (ATCC 31012) was maintained on way (van Beilen et al. 2001). E2 medium (Brown, Gunasekera and Ruiz 2014) with either 1% Aerobic alkane degradation is best characterized in the v/v dodecane (Smits et al. 2002) or 0.01% v/v ethanol (Dams- ◦ AlkB-containing Pseudomonas putida GPo1 (van Beilen, Wubbolts Kozlowska and Kaplan 2007)at30 C. and Witholt 1994; van Beilen et al. 2001). Acinetobacter alkane monooxygenases belong to a novel family and are referred to as RNA extraction, quantification and library construction AlkM instead. Most Acinetobacters are known to have two alkane Based on the growth conditions reported in literature (Rosenberg monooxygenases (AlkM) that degrade overlapping ranges of et al. 1982; Ratajczak, Geissdorfer¨ and Hillen 1998;Smitset al. alkanes (generally C9–C40) (van Beilen et al. 2003, 2007). The 2002), RAG-1 was grown in triplicates on three different carbon AlkM-based alkane degradation is not well characterized in sources: dodecane (1% v/v), dodecanol (5 mM) and sodium ac- comparison to AlkB. Given the low amino acid similarity of AlkB etate (0.2% w/v). The cells were harvested at mid-log phase. Total and AlkM (13), it is possible that AlkM has a different mecha- RNA was extracted using the Qiagen’s RNeasy Mini Kit followed nism of alkane oxidation, which might prove useful in alkane by DNase treatment to eliminate any DNA contamination. RNA bioremediation under certain conditions. obtained was analyzed using the Agilent 2100 Bioanalyzer. The Previously, Mara et al. (2012) found that RAG-1 significantly total RNA samples were prepared for Illumina Next-Generation outperforms 16 other Acinetobacter strains in terms of the Sequencing using the RiboZero kit and PrepXTM RNA-Seq Li- biomass accumulated when grown on n-alkanes. More recently, brary Preparation Kit at the Functional Genomics Lab (QB3- Fondi et al. (2016) have shown that RAG-1 has an exceptional Berkeley Core Research Facility, Berkeley, USA) and sequenced ability to degrade C10–C25 n-alkanes. This prompted us to study on Illumina HiSeq2000. genes involved in alkane uptake and oxidation in RAG-1. The whole-genome sequence of this strain is available (Fondi et al. RNA-Seq data analysis 2012). It contains two alkane-metabolizing proteins AlkMa and AlkMb with 60% identity to each other. RAG-1 has been widely The RAG-1 genome (NCBI accession number APPO00000000.1) studied for its ability to produce a potent biosurfactant, emulsan was uploaded to RAST (Aziz et al. 2008; Overbeek et al. 2014; (Rosenberg et al. 1982; Pines and Gutnick 1986; Nakar and Gut- Brettin et al. 2015) server for annotation. The trimmed, nick 2001;Peleget al. 2012). Although it has been postulated that rRNA-depleted RNA-Seq reads were mapped against the emulsan assists in alkane uptake, additional mechanisms that RAST-annotated RAG-1 genome using the CLC Bio Genomics aid uptake and mitigate the potential alcohol toxicity have not Workbench 8.0.2 software (http://www.clcbio.com/products/ been studied. clcgenomicsworkbench), which re-implemented EdgeR RNA Microarray-based alkane transcriptional response has been quantification workflow (Robinson, McCarthy and Smyth studied in the AlkB-containing strains Alcanivorax borkumensis 2010). Genes exhibiting at least 2-fold
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